I would do three things right away.
The first is a direction to make federal lands available for community land trusts to develop new housing.
The second would be to waive the GST or HST on new affordable housing developments so that it doesn't go straight onto the debt service of that housing.
The third would be to create an equity fund to partner with the community and with the private sector to invest in the development of affordable housing to reduce that cost between housing and income.